* html {
    background-image: url(about:blank);
    background-attachment: fixed;
}

.masklayer {
    background-color: #ccc;
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    filter: alpha(opacity=10);
    z-index: 1;
    display: none;
}

.ie6_masklayer {
    _position: absolute;
    _width: expression(eval(document.documentElement.clientWidth) );
    _height: expression(eval(document.documentElement.clientHeight) );
    _top: expression(eval(document.documentElement.scrollTop) );
    _left: expression(eval(document.documentElement.scrollLeft) );
}

.floatwindow {
    width: 1px;
    height: 1px;
    font-size: 0px;
    position: fixed;
    left: 50%;
    top: 50%;
    z-index: 2;
}

.ie6_floatwindow {
    _margin-left: 0px;
    _margin-top: 0px;
    _position: absolute;
    _bottom: auto;
    _top: expression(eval(document.documentElement.scrollTop +(
		   document.documentElement.clientHeight)/2 ) );
    _left: expression(eval(document.documentElement.scrollLeft +(
		   document.documentElement.clientWidth)/2 ) );
}